- Civil Lab Mechanical Lab Engineering Lab Equipments
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CAT NO: DIDACTICNLE-Export-053012
Combined Bending and Torsion Apparatus- Engineering Lab Training Systems.
Features
Low cost effective teaching
Self-contained
Bench-mounted
Range of specimen materials
Introduction to theories of failure
Bending and torsional loading ratios
variable
3 year warranty
Range of Experiments
To determine elastic failure of a specimen subjected to several ratios of bending and torsion simultaneously
To compare the results with the established theories of failure
Description
Much
of the design of parts in mechanical and civil engineering is
complicated by there being biaxial or triaxial stresses for which some
failure state has to be determined. Obvious examples are high pressure
cylinders containing liquids or gases and concrete hinges for large
bridge bearings. For more than a century, physicists, mathematicians and
engineers have been proposing various theories of failure. Some
theories have been attempts to explain observed failures while a few
have tried to base a mechanism on fundamental properties of materials.
It
is evident that there is a considerable difference between the behavior
of ductile and brittle materials. That apart, it is quite difficult to
determine failure with sufficient accuracy in experiments designed to
show which failure theory is most applicable. Hence, it is frequently
found that codes of practice lay down what appears to be a somewhat
empirical design method which experience has proved to be workable.
This
simple machine uses inexpensive test specimens made from round bar. The
specimen is clamped at one end to the base bracket and at the other to a
counterbalanced circular loading plate. This plate is graduated in 15°
intervals. A special hanger enables pure bending, pure torque or
combined loads to be applied depending on the position of the plate. The
specimen deflection is measured by a dial gauge mounted diametrically
opposite the load point. In the event of a specimen failure safety is
ensured by set screws
This equipment is part of a range designed
to both demonstrate and experimentally confirm basic engineering
principles. Great care has been given to each item so as to provide wide
experimental scope without unduly complicating or compromising the
design. Each piece of apparatus is self-contained and compact. Setting
up time is minimal, and all measurements are made with the simplest
possible instrumentation, so that the student involvement is purely with
the engineering principles being taught. A complete instruction manual
is provided describing the apparatus, its application, experimental
procedure and typical test results.
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